| Type 4 20mm twin AA machine cannon | |
|---|---|
 | |
| Type | Autocannon |
| Place of origin | Empire of Japan |
| Service history | |
| In service | 1944–1945[1] |
| Used by | Japan |
| Wars | World War II |
| Production history | |
| No. built | 500[1] |
| Specifications | |
| Barrel length | 1.4 m (4 ft 7 in) L/70[2] |
| Shell | 20×142 mm[2] |
| Caliber | 20 mm (0.79 in)[2] |
| Action | Gas operated |
| Rate of fire | 600 rounds/min (maximum) |
| Muzzle velocity | 950 m/s[2] |
| Maximum firing range | 5,500 m (18,000 ft) (horizontal) 3,500 m (11,500 ft) (altitude)[2] |
| Feed system | 2x 20 round box |
Type 4 20 mm twin AA machine cannon was an Imperial Japanese Army (IJA) anti-aircraft gun. It consisted of two Type 98 20 mm AA machine cannon. It was introduced in 1944 and approximately 500 guns were produced.[1][2]
The Type 98 20 mm AA machine cannon was the most common light anti-aircraft gun of the Japanese military and the IJA used it until the end of World War II.[2][3]